贵州龙里丰源铝土矿床元素地球化学特征

吴波; 强希润; 王波; 邓克勇; 黄勇灵; 杨梅

吴波,强希润,王波,邓克勇,黄勇灵,杨梅.贵州龙里丰源铝土矿床元素地球化学特征[J].贵州地质,2023,40(2):121-133

贵州龙里丰源铝土矿床元素地球化学特征

Element Geochemical Characteristics of Fengyuan Bauxite Deposit in Longli，Guizhou

投稿时间：2023-01-27

DOI：

中文关键词: 微量元素稀土元素 CIA指数丰源铝土矿床贵州龙里

英文关键词:Race elements Rare earth element CIA index Fengyuan bauxite deposit Longli,Guizhou

基金项目:本文受NSFC-贵州省喀斯特中心项目“石炭纪-二叠纪古喀斯特演化与铝土矿成矿机制研究”和贵州省自然资源厅公益性基础性地质工作项目“贵州省凯里-瓮安-龙里地区铝土矿成矿期岩相古地理及控矿因素研究”联合资助。

作者	单位
吴波	贵州省地质调查院，贵州贵阳550081
强希润	贵州省地质调查院，贵州贵阳550081
王波	贵州省地质调查院，贵州贵阳550081
邓克勇	贵州省地质调查院，贵州贵阳550081
黄勇灵	贵州省地质博物馆，贵州贵阳550081
杨梅	贵州省地质博物馆，贵州贵阳550081

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中文摘要:

龙里丰源铝土矿床属黔中铝土矿带龙里早石炭世杜内晚期铝土矿成矿亚带，矿体产于丰源铝矿层(FYB)，矿床类型属沉积型铝土矿床。本文通过系统采集钻孔岩心样，进行铝土矿床元素地球化学研究。主量元素结果显示，含铝岩系以Al2O3、SiO₂、TFe2O3及LOI为主，Cr2O3、K2O、Na2O、P2O5、SrO、V2O5、ZrO₂等含量相对较低；微量元素Sr、Zr、Cr、V、Li、B、Ga、Ba等含量相对较高，Be、Pb、Sc、Hf、Nb、Rb、Cs、Ta、Th、U等含量相对较低；CIA指数=69009974，平均9758，总体介于80100，说明丰源铝矿层形成时，化学风化强度强烈，古气候条件显示为炎热、潮湿的气候环境。元素B含量55×10-6143×10-6，平均值为9616×10-6，显示总体为半咸水环境下形成，同时伴有咸水环境，为海陆交互相海相环境。Sr/Ba=24699，平均为317＞1；V/Zr=0221，平均为08＜1，均显示丰源铝土矿床形成于海相沉积环境。稀土元素表明含铝岩系ΣR值较高，ΣLR/ΣHR比值为47133＞1，表现为轻稀土比重稀土富集，轻稀土和重稀土发生了较强分异。铝土矿具有δEu负异常、δCe异常不明显的特征。Ce/Ce=2024，平均22＞1，表明含铝岩系主要形成于氧化的沉积环境。

英文摘要:

In Longli，Fengyuan bauxite deposit belongs to the Longli Early Carboniferous Dunei Late Bauxite Mineralization Subzone of the Central Guizhou Bauxite Belt. The ore body occurs in the Fengyuan bauxite Seam (FYB). The deposit type is sedimentary bauxite deposit. In this paper，element geochemistry of bauxite deposits is studied by systematically collecting core samples from boreholes. The results of major elements show that the aluminiferous rock series is mainly composed of Al2O3，SiO₂，TFe2O3 and LOI，while the contents of Cr2O3，K2O，Na2O，P2O5，SrO，V2O5 and ZrO₂ are relatively low；The contents of trace elements Sr，Zr，Cr，V，Li，B，Ga and Ba are relatively high，while the contents of Be，Pb，Sc，Hf，Nb，Rb，Cs，Ta，Th and U are relatively low；The CIA index was 69.0099.74，with an average of 97.58，with an overall range of 80100，indicating that the chemical weathering intensity was strong when the Fengyuan aluminum deposit was formed，and the paleoclimatic conditions showed a hot and humid climatic environment. Element B content 55143×10-6，average 96.16×10-6，The results show that it was formed in brackish water environment，accompanied by brackish water environment，which is marine-terrestrial interaction-marine environmentSr/Ba=2.469.9，with an average of 31.7＞1；V/Zr=0.22.1，with an average of 0.8＜1，which shows that the Fengyuan bauxite deposit was formed in a marine sedimentary environment. Rare earth elements indicate aluminiferous rock series ΣREE value is high，ΣLR/ΣHR ratio is 4.73.3＞1，which shows that light rare earth is enriched in proportion to rare earth，and light rare earth and heavy rare earth are strongly differentiated. Bauxite has δEu negative anomaly δCe anomaly is not obvious. Ce/Ce=2.02.4，with an average of 2.2＞1，indicating that the aluminiferous rock series was mainly formed in an oxidized sedimentary environment.

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